I have a good friend who wants to put in a 20 KW system, on a new house and looking to do it right. He has been reading a bunch as I have but wants the best equipment available at a reasonable price. He plans to be off the grid so needs batteries and is willing to spend what it takes to do it right. Does anyone out there want to help or offer advice? When he asked me, I said I know what I do know, but don't know what I don't know! I feel there are many out there that might have great ideas, know of good products, and have the latest info. I told him I wish this site had a Will Prowse-approved link for a great package or the components to make one.